Wireless telegraphy.



No. 644,497. Patanted Feb. 27, I900. A. F. COLLINS.

WIRELESS TELEGRAPHY.

(Application filed Nov. 7, 1899.)

(No Model.)

THE cams versus 00. wormumm. WASHINGTON, o c.

ARCHIE FREDERICK COLLINS, OF SARATOGA SPRINGS, NEW YORK, SIGNOR, BYDIRECT AND MESNE ASSIGNMENTS, TO THEAMERIOAN- WIRELESS TELEPHONE ANDTELEGRAPH COMPANY, OF ARIZONA TERRITORY.

WIRELESS TELEGRAPHY.

SPECIFICATION forming part of Letters Patent'No. 644,497, dated February27, 1906.

Application filed November 7, 1899. Serial No. 736,198. (No model.)

To all whom it may concern:

Be it known that LAROHIE FREDERICK 00L- LINs,of Saratoga Springs,in thecounty of Saratoga and State of New York, have invented certain new andusefulImprovements in VVireless Telegraphy, of which the following is aspecification.

My invention relates to certain improvements in wireless telephony andtelegraphy, and more particularly to the coherer used in connection withthe receiving apparatus, the same being so constructed and arranged thatthe resistance is materially lessened and'the local current ofelectricity is varied.

Myinvention further contemplates the use, in connection with thetransmitter, of means whereby the etheric waves are concentrated andcoincidently reflected in parallel lines to the receiver, thuspreventing all possibility of the spreading or diffusion of said waves.

My invention consists of the novel features of construction andarrangement of parts, all of which will be hereinafter fully described,and particularly pointed out in the appended claims.

To more fully comprehend the nature of my invention and the manner inwhich the same is carried out, reference must be had to the accompanyingdrawings, forming part of this specification, wherein- Figure 1represents a sectional elevation of a receiver and transmitterconstructed according to my invention. Fig. 2 represents, on an enlargedscale, a longitudinal section of the coherer. Fig. 3 represents atransverse section thereof, taken on the line 3 3 of Fig. 2. Fig. 4represents, on an enlarged scale, a front view of the wave-reflectorused in connection with the transmitter; and Fig. 5 represents a centralsection thereof, taken on the line 5 5.

Similar reference-numerals indicate corresponding parts in all thefigures of the drawings.

I will first proceed to describe the transmitting apparatus withespecial reference to Figs. 1, 4, and f the drawings, which show theseveral parts of the apparatus in assembled position and thewave-reflector in detail.

3 and 4 designate, respectively, the primary and secondary wires, whichare wound upon the magnet 5, said magnet being pro vided with a vibrator5, and the primary wire 3 leads to and connects with the transmitter 3and the battery 3 in the usual manner. The secondary wire 4 is groundedat 6, and its other terminal is carried to the desired elevation, whereit is supported in any desired or approved manner.

6 designates an oscillator which is in air cuit with the secondary coil4, and in close proximity to this oscillator is a wave-reflector 7, thelatter being formed with a plurality of annular steps 8, whose diametersbecome gradually reduced as they reach the center portion 9.

I will now proceed to describe the receiving apparatus illustrated inFigs. 1, 2, and 3 of the drawings.

1O designates a tube, preferably of glass and of any desired diameterand length,into which are inserted two oppositely-disposed metalconductor-plugs 11, the latter being prefer ably made of brass andhaving their inner ends beveled or inclined, as shown, to provide apocket or space 12 for the reception therein of metal filings or othergranular metallic particles 13, which only partially fill said pocket12. The inner beveled ends of the plugs 11 are connected together bymeans of a small German-silver strip 14 or other kindred metal of highelectrical resistance, andthe plugs 11 and filings 13 are connected incircuit with a magnet 15, arranged above the pocket 12 and upon theoutside of the tube 10.

16 designates a local battery in circuit with the plugs 11 and themagnet 15, so that when the etheric waves coming from the transmittercontact with the wire 15 and through it attack the metal particles inthe coherer of the receiyer the resistance is materially lessened, beingconsiderably aided by the small connecting-plate 14 between the plugs11, thereby causing the magnet 15 to attract the filings or granularparticles 13, which latter will by their own gravity fall back to theiroriginal places. A relay 17 is interposed between the coherer-magnet andthe battery, as shown, from which relay a second circuit 19 is formed,which contains the receiver 20.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. A receiving apparatus for Wireless telegraphy, comprising anon-conductor tube, 0ppositely-disposed conductor-plugs arranged Withinthe tube, and having their inner ends beveled to form a tapering pocket,adapted to receive loose magnetic particles, a local circuit embracingsaid plugs, and filings, and a magnet in said circuit arranged to act onsaid particles, substantially as and for the purpose set forth.

2. A receiving apparatus for Wireless teleg-

